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Sensorless rotor position identification system and method for brushless direct current motor

A technology of brushing DC motor and rotor position, applied in control system, electronic commutator, electronic commutation motor control and other directions, can solve the problems of reducing the reliability of the control system, increasing the cost, increasing the complexity of the motor structure, etc.

Active Publication Date: 2016-06-15
BEIHANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

All these Hall sensors and photoelectric encoders not only increase the cost but also increase the complexity of the motor structure and reduce the reliability of the control system

Method used

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  • Sensorless rotor position identification system and method for brushless direct current motor
  • Sensorless rotor position identification system and method for brushless direct current motor
  • Sensorless rotor position identification system and method for brushless direct current motor

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Embodiment Construction

[0038] Further illustrate the present invention below in conjunction with accompanying drawing. like Figure 1-9 Shown, concrete method of the present invention is as follows:

[0039] like figure 1Shown is a system structure block diagram of the present invention, the system includes 220V AC power supply 1, single-phase uncontrollable rectifier bridge module 2, filter capacitor group 3, bus voltage sensor 4, three-phase inverter bridge module 5, current closed-loop regulation Unit 6, DSP control system 7, power management circuit 8, current sensor 12, position detection circuit 13 and brushless DC motor 14; 220V AC power supply 1 is rectified by single-phase uncontrollable rectifier bridge module 2 to obtain DC voltage input three-phase The inverter bridge module 5; the DSP control system 7 captures the commutation signal 11 generated by the position detection circuit 13 according to the ECAP module 10 and passes through the current closed-loop adjustment unit 6, and then ...

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Abstract

The invention relates to a sensorless rotor position identification system and method for a brushless direct current motor. According to the method, a motor is firstly started by a 'two-step' method; a control system is switched into a motor self-synchronization operation state within a proper rotating speed range; a controller reads a commutation signal and controls a corresponding switch tube to be on or off according to a high-low level change signal generated by a line counter electromotive force zero-crossing point; an interval in which an existing rotor flux is located is further judged according to the signal; three-phase line counter electromotive force is reconstructed according to voltage and current signals obtained by a sensor; two-phase voltage components under an alpha-beta coordinate are obtained through coordinate transformation; arc tangent values are determined; and the arc tangent values and the interval are corrected by each other, so that a transient rotor flux position can be obtained. The hardware system is simplified; the estimation accuracy is improved; the system reliability is strengthened; the sensorless rotor position identification system and method are easy to debug and flexible to implement; and the disadvantage of low rotor position resolution of a brushless direct current motor square wave drive technology is compensated.

Description

technical field [0001] The invention relates to a rotor position recognition system and method controlled by a brushless direct current motor without a position sensor, which can be used for the rotor position recognition and high-efficiency drive of the brushless direct current motor installed without a position sensor. Background technique [0002] In recent years, brushless DC motors have attracted more and more attention because of their high efficiency, high torque-to-current ratio, and high energy density, and are widely used in aerospace technology, industrial manufacturing, instrumentation, and electric drives. and other industrial fields. In order to realize the real-time control of the brushless DC motor, it is necessary to know the precise position of the rotor flux linkage relative to the stator winding. Normally, a brushless DC motor with trapezoidal wave back EMF is commutated every 60° electrical angle, so 6 commutation signals are required for one cycle, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18
CPCH02P6/182
Inventor 刘刚陈宝栋郑世强韩邦成毛琨
Owner BEIHANG UNIV
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